MEMORY DEVICE, MEMORY CONTROL CLOCK SETTING METHOD, DIGITAL DEVICE, AND RECORDING MEDIUM HAVING RECORDED MEMORY CONTROL CLOCK SETTING PROGRAM THEREON

摘要

PROBLEM TO BE SOLVED: To optimize the access time of a memory and to adjust a phase without any manual work by using a measuring instrument. SOLUTION: A phase adjusting means 11 shifts the phase of a select clock waveform from a reference clock 106. The matching result of read and write data of the memory 3 when a memory clock 111 is fixed to a certain phase and an input register clock 110 is shifted to all phases is saved. The phase of the clock maximizing the number of matching clock waveforms is selected. A control means 10 sets and fixes a register clock effective signal 102, a register clock select signal 104, a memory clock effective signal 103, and a memory clock select signal 105 and outputs an end signal 101.